Declaration Of Incorrect Marital Status- Invalidation Of ALL Nominations

My 39 year old brother died of cardiac arrest and he was employed with TCS in Mumbai. He was having a bad marriage, harassment by his wife and had filed for a divorce petition which was active while he died. Due to these circumstances, he had willfully chosen not to update his marital status with the employer to avoid any exploitation by wife through future claims. Father was the sole nominee for all the benefits- PF, Gratuity, EDLI, Pension and Group Life Insurance. Since he had stated his marital status to be 'single' during Nominations, TCS has considered all his nominations to be INVALID. TCS, therefore, has denied any Life Insurance benefit to the father who was the sole beneficiary nominee. I sincerely appreciate any guidance by the experts here on each of the benefit components. I understand that PF, Pension would have the claims by the legal heirs but what about the Group Life Insurance. Isn't the beneficial nominee (father) the only person who should be receiving it? Thank you